Means for equalizing shocks at the injection of fuel into engines operating according to the system solid injection



Oct. 19,1926. 1,603,585

A. U. S. DANIELSSON MEANS FOR EQUALIZING SHOCKS AT THE INJECTION OF FUEL INTO ENGINES OPERATING ACCORDING TO THE SYSTEM SOLID INJECTION Filed Nov. 21,- 1924 2K 6. Janie Zmsvn/ 17m,

'nxnr. U'NO srunn DANIELSSON,

Patented Oct. 19 1926.

UNITE STATES 1,603,585 PATENT OFFICE.

EOLAGET ATLAS DIESEL, F STOCKHOIIM, SWEDEN, AOOEPOIBIATION OF SWEDEN.

MEANS FOR EQUALIZING SHOCKS AT THE INJECTION OF FUEL INTO'ENGINES OPEB'.

ATING ACCORDING TO THE SYSTEM SOLID INJECTION.

Application filed November 21, 1924, SeriaFNo. 751,368, and i'n Sweden April 29, 1924.

At the injection of liquid fuel into the combustion chamber of engines by means of a force'pump or the like (solidinjection) forcible shocks are effected in the conduit extending from the ordinary overflow-valve controlled by a governor and adapted to return: to the suction side of the pump the uantity of fuel superfluous for the, driving of the engine at a certain load, said shocks being due to the great pressure of the fuel andbeing able to untighten joint bolts and the like. Besides, the fuel owning to its great velocity often tears off pieces from joint-packin s, which pieces may accompany the'fuel an stick for instance in the suction valve of the pump. and put the engine out of action. For the removing of the said shocks the engines, according to this invention, are provid -with' an air-receptacle which communicates with the conduit for the superfluous fuel quantity and receives the said fuel and from which the fuel then returns, at reduced velocity, to the suction pipe of the pump or to the fuel receptacle.

In the accompanying drawing the top part of an internal combustion engine provided with a shock equilzing device is shown in vertical section.

In a head fixed in the top end of the working cylinder of the engine a. cylinder 1 of a fuel pump is inserted, said cylinder 1 being in screw-threaded engagement with'the head. The plunger 2 of thepump is actuated by the'crank shaft of the engine. 3 is the suction valve of the pump, permitting .the fuel to pass sucked from a receptacle through apipe 4. The fuel -sucked into the pump is forced by the plunger 2 through a channel 5 to a valve for instance 'a needle valve leading to. the working cylinder, which valve is opened by the fuel against the pressure of a spring and admits the fuel into the combustion-chamber of the engine and is shut, as soon as the pressure of the .fuel' in the conduit 5 ceases. fi-ishn'overflow-valve, which communicates with the pump-cylinder through a' channel 7. Between the 'valve 6 and a rod slidable in a 7 guide 8 andactuated by a spring 9, a spring 11 is located. A two-armed lever 13, which swings on an accentric pin 12, extends with he ar-m nder afiange on the rod 10 and, as

he load of-the engine varies, serves to raise the rod 10 at an earlier or later point of the the engine is able to escape through the" valve 6. Lever 13 is actuated for instance by a cam disc fixed on the crank shaft of the engine.

mitted the surplus fuel to escape and the;

pressure in the channels and the pumpcyl- As soon as the valve .6 has perinder is reduced at the return stroke of the plunger 2, the valve 6 is closed by the spring According to this invention the valve 6 at its discharge side communicates with an air receptacle 14. In the form of execution.

shown as an example in the drawing the air receptacle is provided in the material of the cylinder head and a channel 15 provided in the sa'idmaterial extends from the valve to the air-receptacle. With the bore provided for the air-receptacle a hallow plug 16 is in screw-threaded engagement, between which,

and the Wall of the bore there is a space 17, into which the channel 15 opens. From the lower part of theair-receptacle a pipe 18 I extends to the suction pipe 4 of the pump.

Engines, arranged according to the system solid in]ection' generally operate. with a very high pressure (300 to 400 atmos- 'pheres) on the injected fuel.

The result is that the fuel passing through the overflowvalve 6 escapes at a very great velocity. The shocks in the conduits etc. and other inconveniences, hitherto caused 'by the fuel rushing forth, are remove by the air-re- ,ceptaclajowing to the fact that thefuel enters the sa11ii, .compressing. the air contained in the receptacle'and for that reason escapes at a considerably reduced speed through the pipe 18 to the fuel-receptacle or the suctionv pipe 4. In the form 'of execution of the airreceptacle shown in the rawi'ng the s ace. .17 between the plug 16 and the inner si e of the bore is filled'withfuel. Fuel ascends to part of which the air-cushion is'provided.

As, owing .to this arrangement, the'fuela certain level inthe plug 16, in the top receptacle and by the plug is prevented fromsporting into the air, the generating of bubblcs is entirely excluded. Air, contained in the entering fuel, collects in the top part of the space 17 and is permitted to escape through an outlet provided at 19 and controlled by a screw.

The air-receptacle may, evidently, be located at any other suitable place and its construction may differ from that illustrated in the drawing.

I claim:

1. In a feeding device for liquid fuel for internal combustion engines, the combinationwith a ump and an overflow valve, a branch con uit connecting said overflow valve with the suction side of said pump, and a chamber in said branch conduit, said chamber being adapted to provide an air cushion to equalize the flow of fuel during the injection operation.

2. In a feeding device for liquid fuel for internal combustion engines, the combination with a umip and an overflow valve, a branch con uit connecting said overflow valve with the suction side of said pump, a

chamber in said branch conduit, and a sec- 2 0nd chamber communicating-with said first mentioned chamber through a liquid seal.

3. In a feeding device for liquid fuel for internal combustion engines, the combination with a pump and an overflow valve,a 30

chamber, a branch conduit connecting the suction side of said pump with the bottom of said chamber, a hollow plug adapted to be inserted in the top of said chamber, said plug being provided wtih a reduced portion 35 at its lower end to provide an annular space between the plugand the wall .of said chamber, said lower end being spaced from the bottom of said chamber, and asecond conduit roviding communication between said over ow valve and said chamber at a point in the chamber above the lower end of said lug.

In testimony whereof, I have hereunto signed my name.

AXEL UNO STURE DANIELSSON. 

